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Publication . Article . Preprint . 2017

Searching for New Physics with $b\to s\tau^+\tau^-$ processes

Capdevila, Bernat; Crivellin, Andreas; Descotes-Genon, Sébastien; Hofer, Lars; Matias, Joaquim;
Open Access   English  
Published: 05 Dec 2017
Publisher: HAL CCSD
Country: France
In recent years, intriguing hints for the violation of Lepton Flavour Universality (LFU) have been accumulated in semileptonic $B$ decays, both in the neutral-current transitions $b\to s\ell^+\ell^-$ (i.e., $R_K$ and $R_{K^*}$) and the charged-current transitions $b\to c\ell^-\bar\nu_\ell$ (i.e., $R_D$, $R_{D^*}$ and $R_{J/\psi}$). LHCb has reported deviations from the Standard Model (SM) expectations in $b\to s\mu^+\mu^-$ processes as well as in the ratios $R_K$ and $R_{K^*}$, which together point at New Physics (NP) affecting muons with a high significance. Furthermore, hints for LFU violation in $R_{D^{(*)}}$ and $R_{J/\psi}$ point at large deviations from the SM in processes involving tau leptons. Together, these hints for NP motivate the possibility of huge LFU-violating effects in $b\to s\tau^+\tau^-$ transitions. In this article we predict the branching ratios of $B\to K\tau^+\tau^-$, $B\to K^{*}\tau^+\tau^-$ and $B_s\to \phi \tau^+\tau^-$ taking into account NP effects in the Wilson coefficients $C_{9(')}^{\tau\tau}$ and $C_{10(')}^{\tau\tau}$. Assuming a common NP explanation of $R_{D^{}}$ , $R_{D^{(*)}}$ and $R_{J/\psi}$, we show that a very large enhancement of $b\to s\tau^+\tau^-$ processes, of around three orders of magnitude compared to the SM, can be expected under fairly general assumptions. We find that the branching ratios of $B_s\to \tau^+\tau^-$, $B_s\to \phi \tau^+\tau^-$ and $B\to K^{(*)}\tau^+\tau^-$ under these assumptions are in the observable range for LHCb and Belle II.
Comment: 7 pages, 1 figure
Subjects by Vocabulary

arXiv: High Energy Physics::Experiment High Energy Physics::Phenomenology


lepton: flavor, universality: violation, new physics, Wilson, branching ratio, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics - Phenomenology, High Energy Physics - Experiment

59 references, page 1 of 6

[1] R. Aaij et al. (LHCb collaboration), Phys.Rev.Lett. 113, 151601 (2014), 1406.6482.

[2] R. Aaij et al. (LHCb), JHEP 08, 055 (2017), 1705.05802.

[3] B. Capdevila, A. Crivellin, S. Descotes-Genon, J. Matias, and J. Virto (2017), 1704.05340.

[4] S. Descotes-Genon, J. Matias, and J. Virto, Phys.Rev. D88, 074002 (2013), 1307.5683.

[5] S. Descotes-Genon, L. Hofer, J. Matias, and J. Virto, JHEP 06, 092 (2016), 1510.04239.

[6] W. Altmannshofer and D. M. Straub (2015), 1503.06199.

[7] T. Hurth, F. Mahmoudi, and S. Neshatpour, Nucl. Phys. B909, 737 (2016), 1603.00865.

[8] W. Altmannshofer, P. Stangl, and D. M. Straub, Phys. Rev. D96, 055008 (2017), 1704.05435.

[9] G. D'Amico, M. Nardecchia, P. Panci, F. Sannino, A. Strumia, R. Torre, and A. Urbano, JHEP 09, 010 (2017), 1704.05438.

[10] L.-S. Geng, B. Grinstein, S. Jaeger, J. Martin Camalich, X.-L. Ren, and R.-X. Shi, Phys. Rev. D96, 093006 (2017), 1704.05446.

Funded byView all
Ruđer Bošković Institute: Twinning for a step forward of the Theoretical Physics Division
  • Funder: European Commission (EC)
  • Project Code: 692194
  • Funding stream: H2020 | CSA
SNSF| Studien auf dem Gebiet der photophysikalischen Chemie
  • Funder: Swiss National Science Foundation (SNSF)
  • Project Code: 2000-002508
  • Funding stream: Project funding | Project funding (Div. I-III)
SNSF| Flavour Physics beyond the Standard Model
  • Funder: Swiss National Science Foundation (SNSF)
  • Project Code: PZ00P2_154834
  • Funding stream: Careers | Ambizione
EC| InvisiblesPlus
  • Funder: European Commission (EC)
  • Project Code: 690575
  • Funding stream: H2020 | MSCA-RISE
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